Yes! You can send communicate individually with anyone registered on your school's classlist site by sending them a private message.
On the Parent Board page, click on 'private message' on the right hand side. Click on 'add recipients' to bring up a dialogue box and start typing the name of the person you want to message and click to select (your computer may find contacts from other places so make sure you select the right person!). Write your message in the text box below then click send when you've finished. You can add more recipients if you want to send the message to a group of people.